The effects of mixed-species root zones on the resistance of soil bacteria and fungi to long-term experimental and natural reductions in soil moisture.

Autor: Wilhelm RC; School of Integrative Plant Science, Cornell University, Ithaca, NY, USA; Agronomy Department, Lilly Hall of Life Sciences, Purdue University, West Lafayette, IN, 47904, USA., Muñoz-Ucros J; School of Integrative Plant Science, Cornell University, Ithaca, NY, USA., Weikl F; Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, Neuherberg, Germany; Technical University of Munich, Professorship of Land Surface Atmosphere Interactions, Freising, Germany., Pritsch K; Institute of Biochemical Plant Pathology, Helmholtz Zentrum München, Neuherberg, Germany., Goebel M; Department of Natural Resources and the Environment, Cornell University, Ithaca, NY, USA., Buckley DH; School of Integrative Plant Science, Cornell University, Ithaca, NY, USA., Bauerle TL; School of Integrative Plant Science, Cornell University, Ithaca, NY, USA. Electronic address: bauerle@cornell.edu.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2023 May 15; Vol. 873, pp. 162266. Date of Electronic Publication: 2023 Feb 22.
DOI: 10.1016/j.scitotenv.2023.162266
Abstrakt: Mixed forest stands tend to be more resistant to drought than species-specific stands partially due to complementarity in root ecology and physiology. We asked whether complementary differences in the drought resistance of soil microbiomes might contribute to this phenomenon. We experimented on the effects of reduced soil moisture on bacterial and fungal community composition in species-specific (single species) and mixed-species root zones of Norway spruce and European beech forests in a 5-year-old throughfall-exclusion experiment and across seasonal (spring-summer-fall) and latitudinal moisture gradients. Bacteria were most responsive to changes in soil moisture, especially members of Rhizobiales, while fungi were largely unaffected, including ectomycorrhizal fungi (EMF). Community resistance was higher in spruce relative to beech root zones, corresponding with the proportions of drought-favored (more in spruce) and drought-sensitive bacterial taxa (more in beech). The spruce soil microbiome also exhibited greater resistance to seasonal changes between spring (wettest) and fall (driest). Mixed-species root zones contained a hybrid of beech- and spruce-associated microbiomes. Several bacterial populations exhibited either enhanced resistance or greater susceptibility to drought in mixed root zones. Overall, patterns in the relative abundances of soil bacteria closely tracked moisture in seasonal and latitudinal precipitation gradients and were more predictive of soil water content than other environmental variables. We conclude that complementary differences in the drought resistance of soil microbiomes can occur and the likeliest form of complementarity in mixed-root zones coincides with the enrichment of drought-tolerant bacteria associated with spruce and the sustenance of EMF by beech.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: